Document Type : RESEARCH PAPER
Departamento de Ortopedia, Instituto Vita, São Paulo, SP, Brazil
Departamento de Radiologia Musculoesquelética, Fleury Medicina e Saúde, São Paulo, SP, Brazil
Objectives: The study aimed to evaluate the clinical and radiological results after endoscopic repair of
gluteus medius muscle injuries and proposed an anatomical classification for the different injury
Methods: A retrospective case series, including patients who had undergone endoscopic repair of the hip abductor
tendon. The surgical procedure was standardized. Magnetic resonance imaging (MRI) studies were analyzed, and
the injuries were classified into three types: nontransfixing partial-extension (nTPE) tear, transfixing partial-extension
(TPE) tear, and transfixing full-extension (TFE) tear. TPE and TFE were considered high-grade tears. The
postoperative outcomes were as follows: duration of walking aid requirement, duration of physical therapy, time to
return to daily activities, modified Harris Hip score (mHHS) and Nonarthritic Hip Score (NAHS) functional scores,
pain visual analog scale (VAS), satisfaction, claudication, Trendelenburg test, and reoperation.
Results: Sixteen patients were included (94% women; mean age 65 years), with a mean follow-up of 42 months
(12-131, range). Out of the cases with preoperative exams available for analysis, four cases (31%) were nTPE,
three (23%) TPE, and six (46%) TFE tears. Thus, 69% of the patients had high-grade injuries. These patients had
a higher degree of fat infiltration (P = 0.034), but this was not correlated with inferior postoperative clinical or
radiological results. One patient required reoperation due to a recurrent injury.
Conclusion: Isolated extra-articular injuries to the tendons of the gluteus medius and minimus evolved satisfactorily
after endoscopic repair. Due to the small number of cases, it was not possible to observe differences in outcomes
between high-and low-grade injuries.
Level of evidence: IV